US4981546AExpiredUtility

Heat-sealing device for thermoplastic films

59
Assignee: BERGEVIN KEVINPriority: Dec 14, 1988Filed: Sep 8, 1989Granted: Jan 1, 1991
Est. expiryDec 14, 2008(expired)· nominal 20-yr term from priority
Inventors:Kevin Bergevin
B29C 66/0062Y10T156/1313B29C 66/7234B29C 66/72321B29C 66/71B29C 66/81831B29C 66/83221B29C 66/81427B29C 66/81422B29C 65/38B29C 66/4312B29C 66/1122B29C 66/849B29C 66/8122B29C 66/81871B29C 66/0044B29C 65/224B29C 65/226B29C 66/3492B29C 65/7433B29C 66/00461B65B 51/30B29C 65/7841B29C 66/349B29C 66/81457B29C 66/80
59
PatentIndex Score
23
Cited by
5
References
4
Claims

Abstract

A heat sealing apparatus includes a pair of sealing jaws and means for closing the jaws, the first of said jaws having an electrical impulse sealing element mounted thereon, covered with a release sheet, and the second of said jaws having a resilient pad mounted thereon, covered with a release sheet, wherein a heat dispersing foil is between the resilient pad and the release sheet which covers the pad.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
       1. In an apparatus for simultaneously sealing and cutting through at least two layers of thermoplastic film, which apparatus includes a pair of sealing jaws and means for closing the jaws, the first of said jaws having an electrical impulse sealing element mounted thereon, said heat sealing element being covered with a release sheet, the second of said jaws having a resilient pad mounted thereon, said resilient pad being covered with a release sheet, the improvement comprising a flexible heat dispersing foil between the resilient pad and the release sheet which covers the pad. 
     
     
       2. An apparatus according to claim 1 wherein the heat dispersing foil is made of nickel or nickel alloy. 
     
     
       3. An apparatus according to claim 1 wherein the release sheets are made from woven glass fibre tape impregnated with polytetrafluoroethylene. 
     
     
       4. An apparatus according to claim 2 wherein the release sheets are made from woven glass fibre tape impregnated with polytetrafluoroethylene.

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